463 lines
12 KiB
C
463 lines
12 KiB
C
/*
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* Simple driver for Texas Instruments LM3642 LED Flash driver chip
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* Copyright (C) 2012 Texas Instruments
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/i2c.h>
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#include <linux/leds.h>
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#include <linux/slab.h>
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#include <linux/platform_device.h>
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#include <linux/fs.h>
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#include <linux/regmap.h>
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#include <linux/workqueue.h>
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#include <linux/platform_data/leds-lm3642.h>
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#define REG_FILT_TIME (0x0)
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#define REG_IVFM_MODE (0x1)
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#define REG_TORCH_TIME (0x6)
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#define REG_FLASH (0x8)
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#define REG_I_CTRL (0x9)
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#define REG_ENABLE (0xA)
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#define REG_FLAG (0xB)
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#define REG_MAX (0xB)
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#define UVLO_EN_SHIFT (7)
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#define IVM_D_TH_SHIFT (2)
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#define TORCH_RAMP_UP_TIME_SHIFT (3)
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#define TORCH_RAMP_DN_TIME_SHIFT (0)
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#define INDUCTOR_I_LIMIT_SHIFT (6)
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#define FLASH_RAMP_TIME_SHIFT (3)
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#define FLASH_TOUT_TIME_SHIFT (0)
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#define TORCH_I_SHIFT (4)
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#define FLASH_I_SHIFT (0)
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#define IVFM_SHIFT (7)
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#define TX_PIN_EN_SHIFT (6)
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#define STROBE_PIN_EN_SHIFT (5)
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#define TORCH_PIN_EN_SHIFT (4)
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#define MODE_BITS_SHIFT (0)
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#define UVLO_EN_MASK (0x1)
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#define IVM_D_TH_MASK (0x7)
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#define TORCH_RAMP_UP_TIME_MASK (0x7)
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#define TORCH_RAMP_DN_TIME_MASK (0x7)
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#define INDUCTOR_I_LIMIT_MASK (0x1)
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#define FLASH_RAMP_TIME_MASK (0x7)
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#define FLASH_TOUT_TIME_MASK (0x7)
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#define TORCH_I_MASK (0x7)
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#define FLASH_I_MASK (0xF)
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#define IVFM_MASK (0x1)
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#define TX_PIN_EN_MASK (0x1)
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#define STROBE_PIN_EN_MASK (0x1)
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#define TORCH_PIN_EN_MASK (0x1)
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#define MODE_BITS_MASK (0x73)
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#define EX_PIN_CONTROL_MASK (0x71)
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#define EX_PIN_ENABLE_MASK (0x70)
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enum lm3642_mode {
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MODES_STASNDBY = 0,
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MODES_INDIC,
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MODES_TORCH,
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MODES_FLASH
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};
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struct lm3642_chip_data {
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struct device *dev;
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struct led_classdev cdev_flash;
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struct led_classdev cdev_torch;
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struct led_classdev cdev_indicator;
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struct work_struct work_flash;
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struct work_struct work_torch;
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struct work_struct work_indicator;
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u8 br_flash;
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u8 br_torch;
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u8 br_indicator;
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enum lm3642_torch_pin_enable torch_pin;
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enum lm3642_strobe_pin_enable strobe_pin;
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enum lm3642_tx_pin_enable tx_pin;
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struct lm3642_platform_data *pdata;
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struct regmap *regmap;
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struct mutex lock;
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unsigned int last_flag;
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};
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/* chip initialize */
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static int lm3642_chip_init(struct lm3642_chip_data *chip)
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{
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int ret;
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struct lm3642_platform_data *pdata = chip->pdata;
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/* set enable register */
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ret = regmap_update_bits(chip->regmap, REG_ENABLE, EX_PIN_ENABLE_MASK,
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pdata->tx_pin);
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if (ret < 0)
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dev_err(chip->dev, "Failed to update REG_ENABLE Register\n");
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return ret;
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}
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/* chip control */
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static int lm3642_control(struct lm3642_chip_data *chip,
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u8 brightness, enum lm3642_mode opmode)
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{
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int ret;
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ret = regmap_read(chip->regmap, REG_FLAG, &chip->last_flag);
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if (ret < 0) {
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dev_err(chip->dev, "Failed to read REG_FLAG Register\n");
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goto out;
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}
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if (chip->last_flag)
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dev_info(chip->dev, "Last FLAG is 0x%x\n", chip->last_flag);
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/* brightness 0 means off-state */
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if (!brightness)
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opmode = MODES_STASNDBY;
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switch (opmode) {
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case MODES_TORCH:
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ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
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TORCH_I_MASK << TORCH_I_SHIFT,
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(brightness - 1) << TORCH_I_SHIFT);
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if (chip->torch_pin)
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opmode |= (TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT);
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break;
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case MODES_FLASH:
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ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
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FLASH_I_MASK << FLASH_I_SHIFT,
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(brightness - 1) << FLASH_I_SHIFT);
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if (chip->strobe_pin)
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opmode |= (STROBE_PIN_EN_MASK << STROBE_PIN_EN_SHIFT);
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break;
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case MODES_INDIC:
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ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
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TORCH_I_MASK << TORCH_I_SHIFT,
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(brightness - 1) << TORCH_I_SHIFT);
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break;
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case MODES_STASNDBY:
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break;
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default:
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return ret;
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}
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if (ret < 0) {
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dev_err(chip->dev, "Failed to write REG_I_CTRL Register\n");
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goto out;
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}
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if (chip->tx_pin)
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opmode |= (TX_PIN_EN_MASK << TX_PIN_EN_SHIFT);
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ret = regmap_update_bits(chip->regmap, REG_ENABLE,
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MODE_BITS_MASK << MODE_BITS_SHIFT,
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opmode << MODE_BITS_SHIFT);
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out:
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return ret;
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}
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/* torch */
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/* torch pin config for lm3642*/
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static ssize_t lm3642_torch_pin_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t size)
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{
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ssize_t ret;
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struct led_classdev *led_cdev = dev_get_drvdata(dev);
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struct lm3642_chip_data *chip =
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container_of(led_cdev, struct lm3642_chip_data, cdev_indicator);
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unsigned int state;
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ret = kstrtouint(buf, 10, &state);
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if (ret)
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goto out_strtoint;
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if (state != 0)
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state = 0x01 << TORCH_PIN_EN_SHIFT;
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chip->torch_pin = state;
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ret = regmap_update_bits(chip->regmap, REG_ENABLE,
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TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT,
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state);
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if (ret < 0)
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goto out;
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return size;
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out:
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dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
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return ret;
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out_strtoint:
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dev_err(chip->dev, "%s: fail to change str to int\n", __func__);
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return ret;
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}
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static DEVICE_ATTR(torch_pin, S_IWUSR, NULL, lm3642_torch_pin_store);
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static void lm3642_deferred_torch_brightness_set(struct work_struct *work)
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{
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struct lm3642_chip_data *chip =
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container_of(work, struct lm3642_chip_data, work_torch);
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mutex_lock(&chip->lock);
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lm3642_control(chip, chip->br_torch, MODES_TORCH);
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mutex_unlock(&chip->lock);
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}
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static void lm3642_torch_brightness_set(struct led_classdev *cdev,
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enum led_brightness brightness)
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{
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struct lm3642_chip_data *chip =
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container_of(cdev, struct lm3642_chip_data, cdev_torch);
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chip->br_torch = brightness;
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schedule_work(&chip->work_torch);
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}
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/* flash */
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/* strobe pin config for lm3642*/
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static ssize_t lm3642_strobe_pin_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t size)
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{
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ssize_t ret;
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struct led_classdev *led_cdev = dev_get_drvdata(dev);
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struct lm3642_chip_data *chip =
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container_of(led_cdev, struct lm3642_chip_data, cdev_indicator);
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unsigned int state;
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ret = kstrtouint(buf, 10, &state);
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if (ret)
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goto out_strtoint;
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if (state != 0)
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state = 0x01 << STROBE_PIN_EN_SHIFT;
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chip->strobe_pin = state;
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ret = regmap_update_bits(chip->regmap, REG_ENABLE,
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STROBE_PIN_EN_MASK << STROBE_PIN_EN_SHIFT,
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state);
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if (ret < 0)
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goto out;
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return size;
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out:
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dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
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return ret;
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out_strtoint:
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dev_err(chip->dev, "%s: fail to change str to int\n", __func__);
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return ret;
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}
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static DEVICE_ATTR(strobe_pin, S_IWUSR, NULL, lm3642_strobe_pin_store);
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static void lm3642_deferred_strobe_brightness_set(struct work_struct *work)
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{
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struct lm3642_chip_data *chip =
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container_of(work, struct lm3642_chip_data, work_flash);
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mutex_lock(&chip->lock);
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lm3642_control(chip, chip->br_flash, MODES_FLASH);
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mutex_unlock(&chip->lock);
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}
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static void lm3642_strobe_brightness_set(struct led_classdev *cdev,
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enum led_brightness brightness)
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{
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struct lm3642_chip_data *chip =
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container_of(cdev, struct lm3642_chip_data, cdev_flash);
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chip->br_flash = brightness;
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schedule_work(&chip->work_flash);
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}
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/* indicator */
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static void lm3642_deferred_indicator_brightness_set(struct work_struct *work)
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{
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struct lm3642_chip_data *chip =
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container_of(work, struct lm3642_chip_data, work_indicator);
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mutex_lock(&chip->lock);
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lm3642_control(chip, chip->br_indicator, MODES_INDIC);
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mutex_unlock(&chip->lock);
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}
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static void lm3642_indicator_brightness_set(struct led_classdev *cdev,
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enum led_brightness brightness)
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{
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struct lm3642_chip_data *chip =
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container_of(cdev, struct lm3642_chip_data, cdev_indicator);
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chip->br_indicator = brightness;
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schedule_work(&chip->work_indicator);
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}
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static const struct regmap_config lm3642_regmap = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = REG_MAX,
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};
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static struct attribute *lm3642_flash_attrs[] = {
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&dev_attr_strobe_pin.attr,
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NULL
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};
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ATTRIBUTE_GROUPS(lm3642_flash);
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static struct attribute *lm3642_torch_attrs[] = {
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&dev_attr_torch_pin.attr,
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NULL
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};
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ATTRIBUTE_GROUPS(lm3642_torch);
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static int lm3642_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct lm3642_platform_data *pdata = dev_get_platdata(&client->dev);
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struct lm3642_chip_data *chip;
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int err;
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
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dev_err(&client->dev, "i2c functionality check fail.\n");
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return -EOPNOTSUPP;
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}
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if (pdata == NULL) {
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dev_err(&client->dev, "needs Platform Data.\n");
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return -ENODATA;
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}
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chip = devm_kzalloc(&client->dev,
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sizeof(struct lm3642_chip_data), GFP_KERNEL);
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if (!chip)
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return -ENOMEM;
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chip->dev = &client->dev;
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chip->pdata = pdata;
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chip->tx_pin = pdata->tx_pin;
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chip->torch_pin = pdata->torch_pin;
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chip->strobe_pin = pdata->strobe_pin;
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chip->regmap = devm_regmap_init_i2c(client, &lm3642_regmap);
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if (IS_ERR(chip->regmap)) {
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err = PTR_ERR(chip->regmap);
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dev_err(&client->dev, "Failed to allocate register map: %d\n",
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err);
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return err;
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}
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mutex_init(&chip->lock);
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i2c_set_clientdata(client, chip);
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err = lm3642_chip_init(chip);
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if (err < 0)
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goto err_out;
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/* flash */
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INIT_WORK(&chip->work_flash, lm3642_deferred_strobe_brightness_set);
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chip->cdev_flash.name = "flash";
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chip->cdev_flash.max_brightness = 16;
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chip->cdev_flash.brightness_set = lm3642_strobe_brightness_set;
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chip->cdev_flash.default_trigger = "flash";
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chip->cdev_flash.groups = lm3642_flash_groups,
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err = led_classdev_register((struct device *)
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&client->dev, &chip->cdev_flash);
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if (err < 0) {
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dev_err(chip->dev, "failed to register flash\n");
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goto err_out;
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}
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/* torch */
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INIT_WORK(&chip->work_torch, lm3642_deferred_torch_brightness_set);
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chip->cdev_torch.name = "torch";
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chip->cdev_torch.max_brightness = 8;
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chip->cdev_torch.brightness_set = lm3642_torch_brightness_set;
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chip->cdev_torch.default_trigger = "torch";
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chip->cdev_torch.groups = lm3642_torch_groups,
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err = led_classdev_register((struct device *)
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&client->dev, &chip->cdev_torch);
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if (err < 0) {
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dev_err(chip->dev, "failed to register torch\n");
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goto err_create_torch_file;
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}
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/* indicator */
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INIT_WORK(&chip->work_indicator,
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lm3642_deferred_indicator_brightness_set);
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chip->cdev_indicator.name = "indicator";
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chip->cdev_indicator.max_brightness = 8;
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chip->cdev_indicator.brightness_set = lm3642_indicator_brightness_set;
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err = led_classdev_register((struct device *)
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&client->dev, &chip->cdev_indicator);
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if (err < 0) {
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dev_err(chip->dev, "failed to register indicator\n");
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goto err_create_indicator_file;
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}
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dev_info(&client->dev, "LM3642 is initialized\n");
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return 0;
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err_create_indicator_file:
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led_classdev_unregister(&chip->cdev_torch);
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err_create_torch_file:
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led_classdev_unregister(&chip->cdev_flash);
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err_out:
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return err;
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}
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static int lm3642_remove(struct i2c_client *client)
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{
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struct lm3642_chip_data *chip = i2c_get_clientdata(client);
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led_classdev_unregister(&chip->cdev_indicator);
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flush_work(&chip->work_indicator);
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led_classdev_unregister(&chip->cdev_torch);
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flush_work(&chip->work_torch);
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led_classdev_unregister(&chip->cdev_flash);
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flush_work(&chip->work_flash);
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regmap_write(chip->regmap, REG_ENABLE, 0);
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return 0;
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}
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static const struct i2c_device_id lm3642_id[] = {
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{LM3642_NAME, 0},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, lm3642_id);
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static struct i2c_driver lm3642_i2c_driver = {
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.driver = {
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.name = LM3642_NAME,
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.owner = THIS_MODULE,
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.pm = NULL,
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},
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.probe = lm3642_probe,
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.remove = lm3642_remove,
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.id_table = lm3642_id,
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};
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module_i2c_driver(lm3642_i2c_driver);
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MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM3642");
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MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
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MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>");
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MODULE_LICENSE("GPL v2");
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